Cisco Cisco Aironet 3700i Access Point 백서

 

 

© 2015 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public Information. 

Page 22 of 23 

Legacy Features with High Density Experience 

It is important to keep in mind that Cisco’s accumulated expertise in wireless LAN is not being abandoned. HDX 

builds upon what Cisco has learned from our proven solutions and uses it to continue meeting the needs of rapidly 

growing deployments and use cases. Legacy access points cannot support all of the HDX features. But RRM, 

CCA/RX-SOP, DFS, antennas, and more continue to add value. Each of these is considered briefly in the sections 

that follow. 

Radio resource management (RRM) remains an essential component for Cisco’s wireless LAN solution; this does 

not change with HDX. In fact, given the emergence of 802.11ac with 80-MHz channel widths and potentially 160-

MHz channel width in the future, RRM becomes more important in automatically configuring RF settings such as 

dynamic channel assignment and transmit power. HDX continues to interaction with and depend upon RRM. 

CCA (clear channel assessment) and RX-SOP (receive start of packet) are extraordinarily complementary to RRM 

for appropriately sizing WLAN cells in a high-density environment. It is best to think of CCA, TPC (transmit power 

control), and RX-SOP as working in tandem for determining optimal cell size. 

The ability to use spectrum requiring radar detection is fully supported in HDX. Support for DFS (dynamic 

frequency selection) permits many more channels to be used, which is essential for environments with many 

access points and/or many WLANs. 

HDX is fundamentally independent of the antenna configuration and works with both integrated and external 

antennas. However, many high-density environments will benefit from the use of highly directional external 

antennas in order to prevent interference from neighboring access points and/or neighboring WLANs. 

The ability of Band Select to steer dual-band-capable clients from 2.4 GHz to 5 GHz also continues as an essential 
component of Cisco’s WLAN solution. Some enhancements to Band Select have been proposed and are under 

consideration for future software releases. 

The importance of reliable delivery for multicast video over wireless has not diminished; therefore, the capabilities 
provided by VideoStream also persist as a key component of Cisco’s WLAN solution. Some enhancements to 

VideoStream have been proposed specifically for a high-density environment and are under consideration for 

future software releases. 

Conclusions and Summary 

A large proportion of WLAN deployments have already evolved into high-density environments. The tendency 

toward high-density WLAN deployments will continue to increase in the coming years as Wi-Fi proliferates. Use 
cases in these scenarios will exhibit bottlenecks that will worsen over time. Cisco’s High Density Experience 

pr

ovides solutions for today’s high-density challenges and lays the groundwork to meet evolving and emerging 

requirements.